Atex Etr; Klixon - Danfoss VLT AutomationDrive FC 300 Operating Instructions Manual

How to Programme the Low Ha...
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6 6
Illustration 6.6 ETR profile

6.1.3.4 ATEX ETR

The B-option MCB 112 PTC Thermistor option offers ATEX
approved monitoring of motor temperature. Alternatively,
an external ATEX approved PTC protection device can be
used.
NOTE
Only ATEX Ex-e approved motors may be used for this
function. See motor nameplate, approval certificate, data
sheet or contact motor supplier.
When controlling an Ex-e motor with "Increased Safety", it
is important to ensure certain limitations. The parameters
that must be programmed are presented in the following
application example.
72
f OUT = 1 x f M,N (par. 1-23)
f OUT = 2 x f M,N
f OUT = 0. 2 x f M,N
I
1.6 1.8 2.0
1.2 1.4
MG34O202 - VLT
VLT Automation Low Harmonic Drive Operating Instructions
Function
1-90 Motor Thermal
Protection
1-94 ATEX ETR cur.lim. speed
reduction
1-98 ATEX ETR interpol.
points freq.
1-99 ATEX ETR interpol
points current
1-23 Motor Frequency
I
4-19 Max Output Frequency
M
(par. 1-24)
MN
4-18 Current Limit
5-15 Terminal 33 Digital
Input
5-19 Terminal 37 Safe Stop
14-01 Switching Frequency
14-26 Trip Delay at Inverter
Fault
Table 6.3
CAUTION
It is mandatory to compare the minimum switching
frequency requirement stated by the motor manufacturer
to the minimum switching frequency of the frequency
converter the default value in 14-01 Switching Frequency. If
the frequency converter does not meet this requirement, a
sine wave filter must be used.
More information about ATEX ETR Thermal Monitoring can
be found in the Application Note MN33GXYY.

6.1.3.5 Klixon

The Klixon type thermal circuit breaker uses a KLIXON
metal dish. At a predetermined overload, the heat caused
by the current through the disc causes a trip.
Using a digital input and 24 V as power supply:
Example: The frequency converter trips when the motor
temperature is too high
Parameter set-up:
Set 1-90 Motor Thermal Protection to Thermistor Trip [2]
Set 1-93 Thermistor Source to Digital Input [6]
®
is a registered Danfoss trademark
Parameters
Setting
[20] ATEX ETR
20%
Motor name plate
Enter the same value as for
4-19 Max Output Frequency
Motor name plate, possibly
reduced for long motor cables,
sinus filter or reduced supply
voltage
Forced to 150% by 1-90 [20]
[80] PTC Card 1
[4] PTC 1 Alarm
Check that the default value fulfils
the requirement from Motor
name plate. If not -use sine wave
filter.
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